Added couple of options to extend the directive:
Added couple of options to extend the directive:

1) 'triggerPrevent': To prevent default event behavior unless its value is false.
2) 'scopeEvent': To bind against directive's scope event rather than root scope.

zpzgone/nsPopover,gabehayes/nsPopover,britter/nsPopover,BetterWorks/nsPopover,gabehayes/nsPopover,silentlagoon/nsPopover,silentlagoon/nsPopover,BetterWorks/nsPopover,nohros/nsPopover,mavencare/nsPopover,nohros/nsPopover,maxdow/nsPopover,britter/nsPopover,maxdow/nsPopover,mavencare/nsPopover,zpzgone/nsPopover